8
If the above is not fulfilled, GRUNDFOS can refuse
to accept the pump for service. Possible costs of
returning the pump are paid by the customer.
The safety declaration can be found at the end of these
instructions (only in English).
Note:
The replacement of the supply cable must be
carried out by an authorised GRUNDFOS service
workshop.
6. Fault finding chart
7. Disposal
Disposal of this product or parts of it must be carried
out according to the following guidelines:
1. Use the local public or private waste collection
service.
2. In case such waste collection service does not
exist or cannot handle the materials used in the
product, please deliver the product or any haz-
ardous materials from it to your nearest
GRUNDFOS company or service workshop.
Fault
Cause
Remedy
The dosing has
stopped or the output
is too low.
Valves leaking or blocked.
Check and clean valves.
Valves incorrectly installed.
Remove and fit valves. Check that the arrow
on the valve casing is pointing in the liquid
flow direction. Check that all O-rings have
been fitted correctly.
Suction valve or suction pipe/hose
leaking or blocked.
Clean and seal the suction pipe/hose.
Suction lift too high.
Install the pump in a lower position.
Install a priming tank.
Viscosity too high.
Install a pipe/hose with larger cross-section.
Fit spring-loaded valves.
Pump dosing irregu-
larly.
Valves leaking or blocked.
Check and clean the valves.
Leakage from drain
hole.
Diaphragm defective.
Install a new diaphragm.
Frequent diaphragm
failures.
Diaphragm not fastened properly.
Install a new diaphragm and ensure that the
diaphragm is fastened properly.
Counter-pressure too high (meas-
ured at the pump discharge port).
Check the system. Check the injection valve, if
required. Reduce the dosing stroke by fitting a
pulsation dampener.
Sediment in dosing head.
Clean/flush the dosing head.
Subject to alterations.
